Ключевые слова: analysis, analyze, arrow, billboard, black, blackboard, board, business, chalk, chalkboard, chart, class, classroom, color, colour, concept, corporate, crash, crisis, data, decline, decrease, depression, diagram, down, drawing, economy, education, erase, fall, figure, finance, graph, horizontal, illustration, investment, line, market, presentation, recession, red, report, research, sketch, statistics, stock, strategy, vertical, white,